What are side effects for rifampin and tetracycline?

Rifampin

SIDE EFFECTS: This drug may cause stomach upset, heartburn, nausea, headache, drowsiness or dizziness. These effects should disappear as your body adjusts to the medicine. If these effects persist or worsen, inform your doctor promptly. Tell your doctor immediately if any of these unlikely but serious side effects occur: fever, chills, sore throat, nausea, stomach pain, dark urine, yellowing eyes or skin. May cause reddish-orange discoloration of urine, stools, sweat, saliva or tears. This is harmless. Soft contact lenses may become discolored. In the unlikely event you have an allergic reaction to this drug, seek immediate medical attention. Symptoms of an allergic reaction include: rash, itching, swelling, dizziness, trouble breathing. If you notice other effects not listed above, contact your doctor or pharmacist.

Source: http://www.medicinenet.com/rifampin-oral/article.htm

Tetracycline

SIDE EFFECTS: Tetracycline is generally well-tolerated. The most common side effects are diarrhea or loose stools, nausea, abdominal pain, rash, and vomiting. Headache and dizziness may also occur. Tetracycline may cause discoloration of teeth if used in patients below 8 years of age. Exaggerated sunburn can occur with tetracycline (photosensitivity). Therefore, sunlight or sunlamp exposure should be minimized during treatment.

Source: http://www.medicinenet.com/tetracycline/article.htm

Hope that helps.